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Python和Rust对于AI模型的推理速度比较

  • 2026-06-30 14:50:41
Python和Rust对于AI模型的推理速度比较

最近看到,很多前沿的开源仓库采用Rust作为主要语言。

比如,Codex就经历了一次较大的代码重构,将主力语言从Python转换成Rust。

这不仅让我想到一个问题:对于AI模型推理而言,使用Rust是否会比纯用Python更具备速度优势?

本文将通过YOLO26[1]这个目标检测算法为例,探寻这个问题的答案。

Python推理速度统计

下面的实验场景是在Apple M5芯片的设备上,让YOLO26n这个模型去推理一个带有10张图片的文件夹,统计任务总耗时和平均FPS。

下面是一个Python语言编写的推理代码:

import timeimport osfrom ultralytics import YOLOimport torchimage_dir = "images"model_path = "yolo26n.pt"device = "mps" if torch.backends.mps.is_available() else "cpu"print(f"Using device: {device}")model = YOLO(model_path)image_paths = []for name in os.listdir(image_dir):if name.lower().endswith((".jpg"".png"".jpeg")):        image_paths.append(os.path.join(image_dir, name))print(f"检测图片数量: {len(image_paths)}")start_time = time.time()count = 0for path in image_paths:    _ = model.predict(        source=path,        device=device,        verbose=False)    count += 1end_time = time.time()total_time = end_time - start_timefps = count / total_time if total_time > else 0print("\n====== 推理统计 ======")print(f"总图片数: {count}")print(f"总耗时: {total_time:.2f} 秒")print(f"平均FPS: {fps:.2f} 张/秒")

推理结果我分别统计了使用cpu和mps的推理结果,统计如下:

Using device: cpu总图片数: 10总耗时: 0.28 秒平均FPS: 35.99 张/秒Using device: mps总图片数: 10总耗时: 0.68 秒平均FPS: 14.60 张/秒

由于这是一个IO密集型的任务,IO耗时大于计算耗时,使用mps的推理速度反而不如直接使用cpu的推理速度。

Rust推理速度统计

选取YOLO26作为推理比较任务的一大原因是,ultralytics官方有个仓库[2]专门适配了Rust语言的模型推理。

要使用它进行推理,首先需要把pt模型转换成onnx模型。

可以通过以下代码进行转换:

from ultralytics import YOLOmodel = YOLO("yolo26n.pt")model.export(format="onnx")

转换完成后,新建一个rust项目:

cargo new yolo_video_benchcd yolo_video_bench

配置 Cargo.toml 文件:

[package]name = "yolo_video_bench"version = "0.1.0"edition = "2021"[dependencies]ultralytics-inference = { git = "https://github.com/ultralytics/inference.git" }image = "0.24"imageproc = "0.23"

编写 src/main.rs 文件:

use std::error::Error;use std::fs;use std::time::Instant;use ultralytics_inference::{Device, InferenceConfig, YOLOModel};fn main() -> Result<(), Box<dyn Error>> {let image_dir "images";let device = Device::Cpu;let config = InferenceConfig::new().with_device(device);let mut model = YOLOModel::load_with_config("yolo26n.onnx", config)?;let mut image_paths Vec::new();for entry in fs::read_dir(image_dir)? {let path = entry?.path();if let Some(ext) = path.extension() {let ext = ext.to_string_lossy().to_lowercase();if ext == "jpg" || ext == "png" || ext == "jpeg" {                image_paths.push(path);            }        }    }println!("检测图片数量: {}", image_paths.len());let start = Instant::now();let mut count 0;for path in &image_paths {let path_str = path.to_str().unwrap();let = model.predict(path_str)?;        count += 1;    }let total_time = start.elapsed().as_secs_f64();let fps = count as f64 / total_time;println!("\n====== 推理统计 ======");println!("总图片数: {}", count);println!("总耗时: {:.2} 秒", total_time);println!("平均FPS: {:.2} 张/秒", fps);Ok(())}

测试结果如下:

====== 推理统计 ======总图片数: 10总耗时: 0.25 秒平均FPS: 39.30 张/秒

结果发现,使用CPU进行推理时,Rust确实会比Python推理快一些,但领先幅度不高。

本来我还想测试一下使用mps的效果,即把Device::Cpu替换成Device::Mps,但是会出现以下警告:

WARNING ⚠️  Device 'mps' requested but feature not enabled or supported. Falling back to available providers.

该警告说明,虽然官方有这个接口,但并未完全支持,实际还是用CPU进行推理。

近一步优化Python推理速度

实际上,在前面的Python推理测试中,并没完全发挥出它的潜力。

model.predict可以通过增加两个参数,进一步提升推理速度:

  • stream=True:启用流式推理模式,将原本“逐次调用推理”的离散执行方式,转换为“单次调用 + 持续流水线处理”的模式。这样可以复用内部的数据加载与预处理流程,减少重复初始化开销。
  • batch=10:启用批处理机制,将10张图片打包成一个批次进行推理。

完整测试代码如下:

import timeimport osfrom ultralytics import YOLOimage_dir = "images"model_path = "yolo26n.pt"device = "cpu"print(f"Using device: {device}")model = YOLO(model_path)image_paths = [    os.path.join(image_dir, n)for in os.listdir(image_dir)if n.lower().endswith((".jpg"".jpeg"".png"))]print(f"检测图片数量: {len(image_paths)}")start_time = time.perf_counter()results = model.predict(    source=image_paths,    device=device,    stream=True,    batch=10,    verbose=False)count = 0for in results:    count += 1end_time = time.perf_counter()total_time = end_time - start_timefps = count / total_time if total_time > else 0print(f"总图片数: {count}")print(f"总耗时: {total_time:.4f} 秒")print(f"平均FPS: {fps:.2f} 张/秒")

测试结果会比之前快一些。

Using device: cpu检测图片数量: 10总图片数: 10总耗时: 0.2424 秒平均FPS: 41.26 张/秒

总结

从测试结果看,没必要纠结Python和Rust推理谁更快这个问题,语言本身所带来的增益有限,主要在于底层调用的推理引擎,从ultralytics的Rust仓库关注度来说,用Rust重构意义不大。

此外,就生态而言,Python的生态比Rust繁荣得多。本实验中,起初想通过视频推理的实验进行比较,但因Rust和OpenCV/FFMpeg之间的版本依赖问题,最终止步。

因此,无脑选用Python就行,性能问题选用合适的依赖库就能解决。

参考

[1] https://github.com/ultralytics/ultralytics[2] https://github.com/ultralytics/inference

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  1. CONNECT:[ UseTime:0.000638s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000753s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000348s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000285s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000503s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000718s ]
  8. SELECT * FROM `article` WHERE `id` = 487062 LIMIT 1 [ RunTime:0.000952s ]
  9. UPDATE `article` SET `lasttime` = 1783048691 WHERE `id` = 487062 [ RunTime:0.007576s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000263s ]
  11. SELECT * FROM `article` WHERE `id` < 487062 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000501s ]
  12. SELECT * FROM `article` WHERE `id` > 487062 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000521s ]
  13. SELECT * FROM `article` WHERE `id` < 487062 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000692s ]
  14. SELECT * FROM `article` WHERE `id` < 487062 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013832s ]
  15. SELECT * FROM `article` WHERE `id` < 487062 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004423s ]
0.102024s